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POHow to interrupt the Thread when it is inside some loop doing long task?
 

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  1. POHow to interrupt the Thread when it is inside some loop doing long task?
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    <p><strong>Possible Duplicate:</strong> <a href="https://stackoverflow.com/questions/671049/how-do-you-kill-a-thread-in-java">How do you kill a thread in Java?</a></p> <hr> <p>I need to stop doing some big task by sending the interruption signal to the Thread. I am using most of the APIs from java.util.concurrent.*. My task is send to the Thread and is executed. This task comes from the client so I do not have any control over that code. </p> <p>Task are something similar to:</p> <pre><code>public class Task1 extends Thread { public void run() { while(true){ if(Thread.interrupted()){ return; } for(int i=0; i&lt;Integer.MAX_VALUE; i++){ System.out.println("I am task 1 " + i); } } } }; </code></pre> <p>I want to basically stop looping through the for-loop when it receives the interruption signal (Please note that I cannot put the Thread.interrputed() logic inside for-loop as it comes from the client.) I have another class that use the Executor to execute this task.</p> <pre><code>public class ConcurrentTest { public static void main(String[] args) { // TODO Auto-generated method stub ConcurrentTest test = new ConcurrentTest(); ExecutorService executorService = Executors.newFixedThreadPool(2); Task1 task1 = new Task1(); Future&lt;?&gt; runningTask1 = executorService.submit(task1); Task2 task2 = new Task2(); Future&lt;?&gt; runningTask2 = executorService.submit(task2); //Stop First task after 5 second try { TimeUnit.SECONDS.sleep(5); } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } runningTask1.cancel(Boolean.TRUE); System.out.println("runningTask1.isDone is " + runningTask1.isDone()); System.out.println("runningTask1.isCancelled is " + runningTask1.isCancelled()); //Stop Second task after 10 second try{ TimeUnit.SECONDS.sleep(3); }catch(InterruptedException e){ e.printStackTrace(); } runningTask2.cancel(Boolean.TRUE); System.out.println("runningTask2.isDone is " + runningTask2.isDone()); System.out.println("runningTask2.isCancelled is " + runningTask2.isCancelled()); } </code></pre> <p>}</p> <p>Task2 is :</p> <pre><code>public class Task2 extends Thread{ public void run() { while(true){ if(Thread.interrupted()){ return; } System.out.println("I am task 2"); } } }; </code></pre> <p>Task2 is interrpted however Task1 is never interrupted and continue executing inside for loop. I cannot put any logic inside client code (something similar to for-loop). I need help from SO community to resolve this issue. Thanks.</p>
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    1. USPrabin Paudel
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    1. COIt's not clear to me why you can't put a check of Thread.interrupted in Thread 1's for loop.
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